Temporal and spatial variation of perchlorate in streambed sediments: Results from in-situ dialysis samplers

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Abstract

The fate of perchlorate (ClO4-) in streambed sediments is becoming a concern due to the increasing number of groundwater and surface water contamination sites in the United States. Dialysis samplers were deployed at three sites over a period of 1 year to determine the vertical distribution of ClO4- in sediment pore water. Results indicated that the spatial and temporal ClO4- penetration into sediments could be affected by numerous factors, such as temperature, microbial degradation, ClO4- surface water concentration, and sediment physico-geological properties. In general, maximum ClO 4- penetration into sediments at the studied sites was 30 cm below the sediment-water surface. The vertical sequential depletion of electron acceptors in sediments suggested that microbial reduction was responsible for ClO4- depletion in stream sediments. Biodegradation of ClO4- occurred over a seasonally variable active depth zone of 1-10 cm. Results implied that there was a rapid natural attenuation potential of perchlorate in saturated near-surface sediments.

Original languageEnglish
Pages (from-to)283-291
Number of pages9
JournalEnvironmental Pollution
Volume136
Issue number2
DOIs
StatePublished - Jul 2005

Keywords

  • Biodegradation
  • Fate
  • Passive sampling
  • Peeper
  • Perchlorate
  • Sediment

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